> How is it going to work on Windows and/or DOS?

It won't work at all. Neither will the stuff in the current draft of
SRFI 205. These APIs purport to implement only the low-level bits of
Unix terminal handling.

Bleeding-edge builds of Windows 10 now have some kind of Linux terminal
support, so presumably these APIs will work with that, but it will be
many years before the vast majority Windows users will have that support
out of the box. The traditional Windows console has a completely
different architecture.

The future cell terminal SRFI
(https://github.com/pre-srfi/cell-terminal) is meant to offer a
higher-level interface, about the same level as the `curses` C library.